A147321 - OEIS

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A147321 as a simple table

n	a(n)
1	1
2	1
3	1
4	1
5	1
6	1
7	3
8	7
9	16
10	39
11	109
12	339
13	1359
14	6341
15	32204
16	186717
17	1250465
18	9543435
19	82560858
20	815884422
21	9279731421
22	121699162939
23	1834559945393
24	31585819621707

[1,1,1,1,1,1,3,7,16,39,109,339,1359,6341,32204, 186717,1250465,9543435,82560858,815884422, 9279731421,121699162939,1834559945393, 31585819621707]